The only hard rock in the state, and both quarries here work it
The stone here is rhyolite, granite and trap rock rather than the limestone and dolomite worked everywhere else in the state, and it is very much harder.
Both operations here work it. Trap Rock and Granite Quarries records 42 employees and sits 0.17 miles from the middle of town. Missouri Red Quarries records 8 and works dimension granite.
Hard igneous aggregate is denser and more abrasive than limestone, so a full body weighs more for the same volume and the material is harder on liners, tailgates and tyres. No wear figure is claimed for that, because the standard abrasion test measures how the rock degrades rather than how it wears steel. What can be said is that the rock here is different in kind from everything else in the state’s work, and a seller should say which one a machine carried.
And the nearest restricted crossing is a third of a mile away
That heavier material meets a road network with a restriction almost at the gate. The nearest of those seven is 0.31 miles out — effectively part of the approach to the gate.
Only one of the seven is county-maintained. The lowest rating among them is 4.5 metric tonnes, below which nothing commercial crosses even empty, and the lowest that still takes a loaded truck is about 13.9 US tons — roughly 1.6 tonnes of stone over an empty tandem’s tare. That crossing takes a truck across barely loaded.
Iron County restricts 8 of 40 county-maintained structures, 20.0 per cent against a state county rate of 12.7. Put the two halves together and the work here is heavier material on tighter routes than most of Missouri, which is a combination that shows up in brakes and running gear rather than on an odometer.
Dump trucks and aggregate haulers off the granite and the trap rock.
- The crossings round here are right on the gate.The nearest restricted one is about a third of a mile out, which is closer than anywhere else we have looked at in this state.
Around the granite quarries, and across Iron County and Reynolds County, there is usually one sitting.